390355081 has 2 divisors, whose sum is σ = 390355082. Its totient is φ = 390355080.

The previous prime is 390355079. The next prime is 390355093. The reversal of 390355081 is 180553093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 376360000 + 13995081 = 19400^2 + 3741^2 .

It is a cyclic number.

It is not a de Polignac number, because 390355081 - 2¹ = 390355079 is a prime.

It is a super-2 number, since 2×390355081² = 304754178525033122, which contains 22 as substring.

Together with 390355079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (390355181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195177540 + 195177541.

It is an arithmetic number, because the mean of its divisors is an integer number (195177541).

Almost surely, 2^390355081 is an apocalyptic number.

It is an amenable number.

390355081 is a deficient number, since it is larger than the sum of its proper divisors (1).

390355081 is an equidigital number, since it uses as much as digits as its factorization.

390355081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 390355081 is about 19757.4057254489. The cubic root of 390355081 is about 730.8360228622.

The spelling of 390355081 in words is "three hundred ninety million, three hundred fifty-five thousand, eighty-one".